package com.example.management.mqtt.config;

import java.util.Locale;

public class CHexConver {
    private final static char[] mChars = "0123456789ABCDEF".toCharArray();
    private final static String mHexStr = "0123456789ABCDEF";
    /**
     * 检查16进制字符串是否有效
     * @param sHex String 16进制字符串
     * @return boolean
     */
    public static boolean checkHexStr(String sHex){
        String sTmp = sHex.toString().trim().replace(" ", "").toUpperCase(Locale.US);
        int iLen = sTmp.length();

        if (iLen > 1 && iLen%2 == 0){
            for(int i=0; i<iLen; i++)
                if (!mHexStr.contains(sTmp.substring(i, i+1)))
                    return false;
            return true;
        }
        else
            return false;
    }

    /**
     * 字符串转换成十六进制字符串
     * @param str String 待转换的ASCII字符串
     * @return String 每个Byte之间空格分隔，如: [61 6C 6B]
     */
    public static String str2HexStr(String str){
        StringBuilder sb = new StringBuilder();
        byte[] bs = str.getBytes();

        for (int i = 0; i < bs.length; i++){
            sb.append(mChars[(bs[i] & 0xFF) >> 4]);
            sb.append(mChars[bs[i] & 0x0F]);
            sb.append(' ');
        }
        return sb.toString().trim();
    }

    /**
     * 十六进制字符串转换成 ASCII字符串
     * @param hexStr String Byte字符串
     * @return String 对应的字符串
     */
    public static String hexStr2Str(String hexStr){
        hexStr = hexStr.toString().trim().replace(" ", "").toUpperCase(Locale.US);
        char[] hexs = hexStr.toCharArray();
        byte[] bytes = new byte[hexStr.length() / 2];
        int iTmp = 0x00;;

        for (int i = 0; i < bytes.length; i++){
            iTmp = mHexStr.indexOf(hexs[2 * i]) << 4;
            iTmp |= mHexStr.indexOf(hexs[2 * i + 1]);
            bytes[i] = (byte) (iTmp & 0xFF);
        }
        return new String(bytes);
    }

    /**
     * bytes转换成十六进制字符串
     * @param b byte[] byte数组
     * @param iLen int 取前N位处理 N=iLen
     * @return String 每个Byte值之间空格分隔
     */
    public static String byte2HexStr(byte[] b, int iLen){
        StringBuilder sb = new StringBuilder();
        for (int n=0; n<iLen; n++){
            sb.append(mChars[(b[n] & 0xFF) >> 4]);
            sb.append(mChars[b[n] & 0x0F]);
            sb.append(' ');
        }
        return sb.toString().trim().toUpperCase(Locale.US);
    }

    /**
     * bytes字符串转换为Byte值
     * @param src String Byte字符串，每个Byte之间没有分隔符(字符范围:0-9 A-F)
     * @return byte[]
     */
    public static byte[] hexStr2Bytes(String src){
        /*对输入值进行规范化整理*/
        src = src.trim().replace(" ", "").toUpperCase(Locale.US);
        //处理值初始化
        int m=0,n=0;
        int iLen=src.length()/2; //计算长度
        byte[] ret = new byte[iLen]; //分配存储空间

        for (int i = 0; i < iLen; i++){
            m=i*2+1;
            n=m+1;
            ret[i] = (byte)(Integer.decode("0x"+ src.substring(i*2, m) + src.substring(m,n)) & 0xFF);
        }
        return ret;
    }

    /**
     * String的字符串转换成unicode的String
     * @param strText String 全角字符串
     * @return String 每个unicode之间无分隔符
     * @throws Exception
     */
    public static String strToUnicode(String strText)
            throws Exception
    {
        char c;
        StringBuilder str = new StringBuilder();
        int intAsc;
        String strHex;
        for (int i = 0; i < strText.length(); i++){
            c = strText.charAt(i);
            intAsc = (int) c;
            strHex = Integer.toHexString(intAsc);
            if (intAsc > 128)
                str.append("\\u");
            else // 低位在前面补00
                str.append("\\u00");
            str.append(strHex);
        }
        return str.toString();
    }

    /**
     * unicode的String转换成String的字符串
     * @param hex String 16进制值字符串 （一个unicode为2byte）
     * @return String 全角字符串
     * @see //CHexConver.//unicodeToString("\\u0068\\u0065\\u006c\\u006c\\u006f")
     */
    public static String unicodeToString(String hex){
        int t = hex.length() / 6;
        int iTmp = 0;
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < t; i++){
            String s = hex.substring(i * 6, (i + 1) * 6);
            // 将16进制的string转为int
            iTmp = (Integer.valueOf(s.substring(2, 4), 16) << 8) | Integer.valueOf(s.substring(4), 16);
            // 将int转换为字符
            str.append(new String(Character.toChars(iTmp)));
        }
        return str.toString();
    }

    /**
     * int到byte[]
     * @param i
     * @return
     */
    public static byte[] intToByteArray(int i) {
        byte[] result = new byte[4];
        //由高位到低位
        result[0] = (byte)((i >> 24) & 0xFF);
        result[1] = (byte)((i >> 16) & 0xFF);
        result[2] = (byte)((i >> 8) & 0xFF);
        result[3] = (byte)(i & 0xFF);
        return result;
    }

    /**
     * byte[]转int
     * @param bytes
     * @return
     */
    public static int byteArrayToInt(byte[] bytes) {
        int value= 0;
        //由高位到低位
        for (int i = 0; i < 4; i++) {
            int shift= (4 - 1 - i) * 8;
            value +=(bytes[i] & 0x000000FF) << shift;//往高位游
        }
        return value;
    }


    //byte 与 int 的相互转换
    public static byte intToByte(int x) {
        return (byte) x;
    }

    public static int byteToInt(byte b) {
        //Java 总是把 byte 当做有符处理；我们可以通过将其和 0xFF 进行二进制与得到它的无符值
        return b & 0xFF;
    }


    /**
     * Byte转Bit
     */
    public static String byteToBit(byte b) {
        return "" + (byte) ((b >> 0) & 0x1) +
                (byte) ((b >> 1) & 0x1) +
                (byte) ((b >> 2) & 0x1) +
                (byte) ((b >> 3) & 0x1) +
                (byte) ((b >> 4) & 0x1) +
                (byte) ((b >> 5) & 0x1) +
                (byte) ((b >> 6) & 0x1) +
                (byte) ((b >> 7) & 0x1);
    }


    public static long bytesToLong(byte[] res) {


        int firstByte = 0;
        int secondByte = 0;
        int thirdByte = 0;
        int fourthByte = 0;
        int index = 0;
        firstByte = (0x000000FF & ((int) res[index]));
        secondByte = (0x000000FF & ((int) res[index + 1]));
        thirdByte = (0x000000FF & ((int) res[index + 2]));
        fourthByte = (0x000000FF & ((int) res[index + 3]));
        index = index + 4;
        return ((long) (firstByte << 24 | secondByte << 16 | thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL;

    }
}
